You can. Just work your way up the ladder and watch for pressure signs, as you would anyway. Just don't take a known 'good' set of load data, change a component, and assume it will work safely. Back off the load a little bit and work it back up.

Absolutely you can provided they are the same weight and same basic design ... jacketed verse non-jacketed is where key differences take place a lot of times imho.

But then, as njcioff stated, work up. Start low and work your way up. Matter of fact I just recently did the exact same thing you are talking about doing with some 158 grain jsp Remington corelock scalloped pills that I picked up in a coffee can at a gun show.

"What you think about, you do ... what you do, you become.""In a nation where anything goes ... everything eventually will."